I had attempted to delete a category in my world called "Gehenna", but for some reason it still shows up, but whenever I click on it, it just says; "Category not found" and prompts me to hit next or previous to get rid of the category. But whenever I click next or previous, nothing happens?

Steps to Reproduce

I have no clue how to reproduce this bug, as far as I'm aware, all I did was attempt to delete 3 separate categories, but one of them bugged.

Operating System

Browser

Related Entity